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lorenalene
Condensation Problem

We live in a 1977 ranch style, single story home. Our master bath consists of the toilet and the shower. There is a light/exhaust fan combo, so whenever we use the shower the fan is running. There is a window, too. The condensation in the room is overwhelming - it doesn't matter if we have the door and window open and the fan on, the condensation is running down the walls and dripping off the light fixture. The only time this doesn't happen is when the sun has been up for a few hours and the temperature outside is over 70F. From the ceiling to about 3 feet down on the walls looks permanently wet and the paint always feels sticky. We are desperate to fix this before any more damage is done: what can we do to solve this condensation problem?

MLBSF
Re: Condensation Problem

sounds like your walls are not insulated. when you take a hot shower and the wall temperature is cold, like 60 degres or less, then you will get a large amount of condensation on the walls. another possibility is that you don't have any heat in your bathroom causing the walls to be cooler than normal. it makes sense that, as the sun warms things up, your problem slowly disappears. what would i do? a little exploring.....cut a small hole in a wall or two and see if it's insulated. install a larger capacity ceiling vent fan. make sure the room is getting heated properly.

HoustonRemodeler
Re: Condensation Problem

Also check the attic insulation above this space. If all the heat is rising out the ceiling, it can't stay in the room.

lorenalene
Re: Condensation Problem

Thanks for your replies. I would guess lack of insulation is an issue; I'm told that insulating houses wasn't a top priority for builders here in Southern California until the last 10 years or so.

Re: Condensation Problem

and check if the exhaust fan is actually exhausting to the exterior. There could be another problem brewing in the attic or wall cavity.

exhaust fans should be on a timer so it can continue to exhaust long after the user has left the room.

If this bathroom is original to the house it's probably time for a full gut and new bath anyway.

bp21901
Re: Condensation Problem

There are different size exhaust fans. Maybe put in one that moves more cfm.

lorenalene
Re: Condensation Problem

The fan is definitely venting to the outside. There is insulation in the attic, but it's pretty old. And while I'd love to gut the room and redo it, we don't have the money for that kind of drastic measure right now.

Timothy Miller
Re: Condensation Problem

Howdy extending the fan venting threw the roof is not $$$$ an you need to do that before you have to do $$$$ repairsts due to mold and rot. Adding attic insulation if you have it blown in it is not $$$$ Consider cellulose or fiberglass and have it to R38 at least. The additional insulation will reduce your heating and cooling utility bills too...

jstevejobs
Re: Condensation Problem

I agree the problem is with exhasut fan, did you check it?

I second the motion

Based on what I read in you problem description. For me, I definitely agree with the majority.Hope you have already solved it.

There are different size exhaust fans. Maybe put in one that moves more cfm.
I have a background on that kind of problem and if is still not solved please email me for more info.

Best Regards

MarcBob
Re: Condensation Problem

I think you need to replace the exhaust fan or maybe the insulation in the attic.

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